CN106207059A - A kind of lithium ion battery separator, its preparation method and application - Google Patents
A kind of lithium ion battery separator, its preparation method and application Download PDFInfo
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- CN106207059A CN106207059A CN201610665821.6A CN201610665821A CN106207059A CN 106207059 A CN106207059 A CN 106207059A CN 201610665821 A CN201610665821 A CN 201610665821A CN 106207059 A CN106207059 A CN 106207059A
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- Prior art keywords
- barrier film
- ion battery
- lithium ion
- aqueous functional
- battery separator
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/431—Inorganic material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/403—Manufacturing processes of separators, membranes or diaphragms
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/411—Organic material
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention provides a kind of lithium ion battery separator, its preparation method and application, described lithium ion battery separator includes barrier film substrate；Being compounded in the aqueous functional layer of described barrier film substrate surface, described aqueous functional layer has multiple micropore, and described aqueous functional layer has viscosity.The barrier film that the embodiment of the present invention provides, for polymer Li-ion battery, will not occur local analysis lithium phenomenon in cyclic process, and battery pole group also will not deform upon and the stability of bigger swelling, beneficially cycle life in cyclic process.Simultaneously, the thermal contraction performance of barrier film makes moderate progress, and the viscosity etc. combining aqueous functional layer acts on, barrier film is bonded together well with electrode, in security testing process or battery be needled extruding distortion the abuse such as bending time, or when using under high ambient temperatures for a long time, the security performance of battery can be greatly improved.
Description
Technical field
The present invention relates to technical field of lithium ion, particularly relate to a kind of lithium ion battery separator, its preparation method and
Application.
Background technology
Owing to having that energy density is high, having extended cycle life and the series of advantages such as open-circuit voltage is high, lithium ion battery more comes
Cause the attention of people manyly.According to the difference of electrolyte used by lithium ion battery, lithium ion battery is divided into liquid lithium
Ion battery (Liquified Lithium-Ion Battery, referred to as LIB) and polymer Li-ion battery (Polymer
Lithium-Ion Battery, referred to as PLB).Positive and negative pole material used by polymer Li-ion battery and liquid lithium ion electricity
Pond is all identical, and battery operated principle is the most basically identical.Their difference differring primarily in that electrolyte, liquid lithium ion
Battery uses liquid electrolyte, and polymer Li-ion battery major part at present uses gel-form solid polymer electrolyte.
Barrier film is the important composition in lithium ion battery, wherein, and the polymeric material that polymer lithium cell diaphragm uses
Material mainly has polyolefin, poly(ethylene oxide), polyacrylonitrile, polymethyl methacrylate (PMMA) and Kynoar (PVDF)
Deng.
But, use the barrier film of above scheme to be easily caused cycle performance concordance and reliability instability, the peace of battery
Full performance needs to be improved further.
Summary of the invention
In view of this, the application provides a kind of lithium ion battery separator, its preparation method and application, the lithium that the present invention provides
Ion battery barrier film can make cycle performance of battery more reliable and more stable, and security performance is more preferable.
The present invention provides a kind of lithium ion battery separator, comprising:
Barrier film substrate；
Being compounded in the aqueous functional layer of barrier film substrate surface, described aqueous functional layer has multiple micropore, described aqueous merit
Ergosphere has viscosity.
Preferably, the plurality of micropore is uniformly distributed.
Preferably, described aqueous functional layer has thermostability.
Preferably, described barrier film substrate has first surface and the second surface opposing with described first surface；
Described aqueous functional layer includes inorganic nano ceramic layer and aqueous functional adhesive layer；
Described barrier film substrate first surface is compounded with described inorganic nano ceramic layer；
Described barrier film substrate second surface is compounded with described aqueous functional adhesive layer；Or；
Described inorganic nano ceramic layer and aqueous functional adhesive layer are all compounded in described at least one surface of barrier film substrate；
Or；
Described aqueous functional layer is by mixing that the mixed material including inorganic nano pottery and aqueous functional binding agent is made
Condensation material layer；Described at least one surface recombination of barrier film substrate has mixed material layer.
Preferably, described inorganic nano ceramic layer and aqueous functional adhesive layer stacking are compounded in described barrier film substrate at least
One surface.
Preferably, described inorganic nano pottery is selected from Al2O3Nano ceramics and Mg (OH)2One or many in nano ceramics
Kind.
Preferably, described aqueous functional binding agent one or many in aqueous functional binding agent AFL, PVDF and PMMA
Kind.
Preferably, the thickness of described inorganic nano ceramic layer is 2～5 μm, and the thickness of described aqueous functional adhesive layer is
0.5～2 μm.
Preferably, the thickness of described mixed material layer is 1～5 μm.
Compared with prior art, the present invention has multiple micropore by arranging at barrier film substrate surface and has sticking water
Sexual function layer, obtains lithium ion battery separator, and it is alternatively referred to as lithium ion battery isolating membrane.The lithium ion battery that the present invention provides
Isolating membrane can be used for polymer Li-ion battery, and aqueous functional layer compound on isolating membrane of the present invention has substantial amounts of micropore and leads to
Road, has viscosity simultaneously, can make to produce between inside battery electrode and isolating membrane bonding, and electrode will not deform upon and interface
Space will not be produced, do not affect the passage of lithium ion conduction, local analysis lithium phenomenon, battery pole group will not occur in cyclic process
Also will not deform upon in cyclic process and the stability of bigger swelling, beneficially cycle life.The present invention implements
The barrier film that example provides for polymer Li-ion battery, in security testing process or battery be needled extruding distortion bending
Deng abuse time, or long-term when using under high ambient temperatures, dislocation short circuit is less likely to occur for internal electrode and isolating membrane, isolation
Film is not easy to be pulled short circuit, even if short circuit occurred inside, the pyrocondensation area of isolating membrane is not easy to expand, the security performance of battery
Can be greatly improved.
It addition, the aqueous functional layer formed on isolating membrane of the present invention has substantial amounts of micro channel, to cell manufacturing process
In hot pressing or fluid injection after ageing process need not too much requirement and management and control, it is not necessary to worry electrolyte to the dissolving of tack coat and
Plug-hole, the cycle performance of battery is more reliable and more stable, and security performance is more preferable, also environmentally safe, is beneficial to application.
The present invention provides the preparation method of a kind of lithium ion battery separator, comprises the following steps:
Inorganic nano ceramic size and aqueous functional binding agent slurry are respectively coated on barrier film substrate one or both sides, warp
It is dried, forms inorganic nano ceramic layer and aqueous functional adhesive layer respectively, obtain lithium ion battery separator；Described aqueous functional
Binding agent slurry includes aqueous functional binding agent and water；
Or, mixed slurry is coated in barrier film substrate one or both sides, drying, forms mixed material layer, obtain lithium
Ion battery barrier film；Described mixed slurry includes inorganic nano pottery, aqueous functional binding agent and water.
The present invention provides a kind of polymer Li-ion battery, and including electrode, electrolyte and barrier film, wherein, described barrier film is
Lithium ion battery separator mentioned above.
The present invention provides the preparation method of a kind of polymer Li-ion battery, comprises the following steps:
Electrode and barrier film are wound successively and seal, injects electrolyte after baking, then carry out hot pressing, obtain polymer
Lithium ion battery；Described barrier film is lithium ion battery separator mentioned above.
Preferably, the temperature of described hot pressing is 80～90 DEG C, and the time of described hot pressing is 1～2h.
Compared with prior art, the embodiment of the present invention by arranging inorganic nano ceramic layer at barrier film substrate surface, and
Aqueous functional adhesive layer, this two-layer can be separately positioned on barrier film substrate two sides or one side, it is also possible to by inorganic nano pottery
Mix with the material such as aqueous functional binding agent, form mixed material layer at barrier film substrate one or both sides, prepare lithium ion
Battery diaphragm.The lithium ion battery separator that the embodiment of the present invention prepares, for polymer Li-ion battery, can make battery
Between internal electrode and barrier film produce bonds well, electrode will not deform upon and interface will not produce space, do not affect lithium from
The passage of son conduction, will not occur analysis lithium phenomenon in local in cyclic process, and battery pole group also will not occur in cyclic process
Deformation and the stability of bigger swelling, beneficially cycle life.Further, have due to inorganic nano ceramic material
Good thermostability, the thermal contraction performance of barrier film significantly improves, and combines aqueous functional adhesive layer, and barrier film is fine with electrode
Be bonded together, in security testing process or battery be needled extruding distortion the abuse such as bending time, or long-term at high temperature
When using under ambient temperature, dislocation short circuit is less likely to occur for internal electrode and barrier film, and barrier film is not easy to be pulled short circuit, though interior
Portion is short-circuited, and the pyrocondensation area of barrier film is not easy to expand, and the security performance of battery can be greatly improved.
It addition, the aqueous coating formed on embodiment of the present invention barrier film has substantial amounts of micro channel, simultaneously to battery system
After hot pressing during Bei or fluid injection, ageing process need not too much requirement and management and control, it is not necessary to worries that electrolyte is to adhesive layer
Dissolving and plug-hole, the cycle performance of battery is more reliable and more stable, and security performance is more preferable, also environmentally safe, is beneficial to application.
Accompanying drawing explanation
The production technological process of the lithium ion battery separator that Fig. 1 provides for some embodiments of the invention；
The production technological process of the polymer Li-ion battery that Fig. 2 provides for some embodiments of the invention；
The SEM photograph of the membrane surface coating that Fig. 3 provides for embodiment 1；
The SEM photograph of the membrane surface coating that Fig. 4 provides for embodiment 2；
The SEM photograph of the membrane surface nano ceramic coat that Fig. 5 provides for embodiment 3；
The SEM photograph of the membrane surface PVDF coating that Fig. 6 provides for embodiment 3；
The SEM photograph of the membrane surface nano ceramic coat that Fig. 7 provides for embodiment 4；
The SEM photograph of the membrane surface PVDF coating that Fig. 8 provides for embodiment 4；
The SEM photograph of the membrane surface function binding agent AFL coating that Fig. 9 provides for embodiment 5；
Figure 10 is experimental group and matched group battery roll core pole group cross section deformation situation before and after embodiment 6 circulation；
Figure 11 is embodiment 6 experimental group, matched group gained battery and the performance comparison result of comparative example 1 gained battery.
Detailed description of the invention
Below the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment
It is only a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, the common skill in this area
The every other embodiment that art personnel are obtained under not making creative work premise, broadly falls into the model of present invention protection
Enclose.
The invention provides a kind of lithium ion battery separator, comprising:
Barrier film substrate；
Being compounded in the aqueous functional layer of barrier film substrate surface, described aqueous functional layer has multiple micropore, described aqueous merit
Ergosphere has viscosity.
The lithium ion battery separator that the present invention provides can make cycle performance of battery more reliable and more stable, and security performance is more preferable,
It is beneficial to application.
The lithium ion battery separator that the present invention provides includes barrier film substrate, uses diaphragm material commonly used in the art.
In the present invention, described barrier film substrate includes two surfaces, i.e. has first surface and opposing with described first surface second
Surface.In some embodiments of the invention, described barrier film substrate can be polyethylene film (PE).In some embodiments of the present invention
In, the thickness of described barrier film substrate can be 5～20 μm, preferably 6～10 μm.
The lithium ion battery separator that the present invention provides includes aqueous functional layer, and it is compounded in described barrier film substrate surface.Institute
Stating aqueous functional layer and have multiple micropore, the plurality of micropore is perfectly even distributed, and lithium ion can be made to conduct well.Described water
Sexual function layer has viscosity, can make to produce between inside battery electrode and barrier film bonding.In the present invention, barrier film or isolating membrane
Upper compound aqueous functional layer has substantial amounts of micro channel, has viscosity simultaneously, can make inside battery electrode and isolating membrane
Between produce bonding, electrode will not deform upon and interface will not produce space, does not affect the passage of lithium ion conduction, Bu Hui
Analysis lithium phenomenon in local occurs in cyclic process, and battery pole group also will not deform upon in cyclic process and bigger expansion is existing
As, the beneficially stability of cycle life.
In the present invention, described aqueous functional layer is to be prepared from the raw material that can be dispersed in water, and it has in a large number
Micro channel, ageing process after the hot pressing in cell manufacturing process or fluid injection be need not too much requirement and management and control, it is not necessary to
Worry electrolyte to the dissolving of tack coat and plug-hole, the cycle performance of battery is more reliable and more stable, and security performance is more preferable.It addition,
Owing to being to use water-dispersible raw material, not being oil-based solvent such as acetone solution raw material, in the embodiment of the present invention, aqueous functional layer is multiple
Micropore is evenly distributed, and is not easy to be blocked by electrolyte, does not affect the passage of lithium ion conduction, is improving cycle performance of battery one
While cause property and reliability, also environmentally safe.
In a preferred embodiment of the invention, described aqueous functional layer has thermostability, for battery such as polymer lithium
During ion battery, the thermal contraction performance of barrier film can be improved.The barrier film that the embodiment of the present invention provides is used for polymer Li-ion battery,
In security testing process or battery be needled extruding distortion the abuse such as bending time, or make under high ambient temperatures for a long time
Dislocation short circuit is less likely to occur for used time, internal electrode and isolating membrane, and isolating membrane is not easy to be pulled short circuit, even if internal generation is short
Road, the pyrocondensation area of isolating membrane is not easy to expand, and the security performance of battery can be greatly improved.
In some currently preferred embodiments of the present invention, described aqueous functional layer includes inorganic nano ceramic layer and aqueous functional
Adhesive layer, described inorganic nano ceramic layer and aqueous functional adhesive layer can be compounded in the two sides or of barrier film substrate respectively
Face.
In some embodiments of the invention, described inorganic nano ceramic layer and aqueous functional adhesive layer are all compounded in institute
Stating at least one surface of barrier film substrate, both preferred stackings are combined.In further preferred embodiment, described barrier film substrate one side
Being compounded with inorganic nano ceramic layer, described inorganic nano surface ceramii layer is compounded with aqueous functional adhesive layer；Described inorganic receive
The thickness of rice ceramic layer can be 2～5 μm, and the thickness of described aqueous functional adhesive layer can be 0.5～2 μm.
In other embodiments of the present invention, described barrier film substrate first surface is compounded with described inorganic nano pottery
Layer；Described barrier film substrate second surface is compounded with described aqueous functional adhesive layer；The thickness of described inorganic nano ceramic layer can
Being 2～5 μm, the thickness of described aqueous functional adhesive layer can be 0.5～2 μm.
In embodiments of the present invention, described inorganic nano ceramic layer is made up of the material including inorganic nano pottery.Described
Inorganic nano pottery preferably is selected from aluminium oxide (Al2O3) nano ceramics and magnesium hydroxide (Mg (OH)2) one or many in nano ceramics
Kind, more preferably aluminium oxide nano pottery.Described aqueous functional adhesive layer is made up of the material including aqueous functional binding agent；
Described aqueous functional binding agent preferably is selected from aqueous functional binding agent AFL, Kynoar (PVDF) and polymethyl methacrylate
(PMMA) one or more in, more preferably aqueous functional binding agent AFL or PVDF.
In embodiments of the present invention, owing to inorganic nano ceramic material has good thermostability, the heat-shrinkable of barrier film
Can significantly improve, and combine aqueous functional adhesive layer, barrier film is bonded together well with electrode, at security testing process
In or battery be needled extruding distortion the abuse such as bending time, or long-term when using under high ambient temperatures, internal electrode with
Dislocation short circuit is less likely to occur barrier film, and barrier film is not easy to be pulled short circuit, even if short circuit occurred inside, the pyrocondensation area of barrier film is not
Easily expanding, the security performance of battery can be greatly improved.It addition, the aqueous layer formed on barrier film of the present invention has substantial amounts of micro-
Hole path, need not too much requirement and management and control to ageing process after the hot pressing in cell manufacturing process or fluid injection simultaneously, it is not necessary to
Worry electrolyte to the dissolving of adhesive layer and plug-hole, the cycle performance of battery is more reliable and more stable, and security performance is more preferable, the most right
Environmental nonpollution.
In other preferred embodiments of the present invention, described aqueous functional layer is for by including inorganic nano pottery and aqueous
The mixed material layer that the mixed material of function binding agent is made；Described at least one surface recombination of barrier film substrate has mixing material
Layer.Wherein, described inorganic nano pottery preferably is selected from aluminium oxide (Al2O3) nano ceramics and magnesium hydroxide (Mg (OH)2) nano ceramics
In one or more, more preferably aluminium oxide nano pottery.Described aqueous functional binding agent preferably is selected from aqueous functional binding agent
One or more in AFL, Kynoar (PVDF) and polymethyl methacrylate (PMMA), more preferably aqueous functional are viscous
Knot agent AFL or PVDF.
In embodiments of the present invention, described mixed material layer can be compounded in barrier film substrate one or both sides；Described mixing
The thickness of material layer is preferably 1～5 μm.In a preferred embodiment of the invention, inorganic nano pottery in described mixed material layer
Proportion more than 70%.In the present invention, surface recombination has the barrier film of described mixed material layer also can improve the safety of battery
Energy.
In the present invention, the method in barrier film substrate surface composite water soluble functional layer can be cladding process, it is also possible to be it
He can form the method for coating.Concrete, embodiments provide the preparation method of a kind of lithium ion battery separator, including
Following steps:
Inorganic nano ceramic size and aqueous functional binding agent slurry are respectively coated on barrier film substrate one or both sides, warp
It is dried, forms inorganic nano ceramic layer and aqueous functional adhesive layer respectively, obtain lithium ion battery separator；Described aqueous functional
Binding agent slurry includes aqueous functional binding agent and water；
Or, mixed slurry is coated in barrier film substrate one or both sides, drying, forms mixed material layer, obtain lithium
Ion battery barrier film；Described mixed slurry includes inorganic nano pottery, aqueous functional binding agent and water.
See the production technological process of the lithium ion battery separator that Fig. 1, Fig. 1 provide for some embodiments of the invention.This
Invent these embodiments and mixed slurry is coated in barrier film substrate one or both sides by gravure printing technique, toasted, obtain
Barrier film finished product.Wherein, described mixed slurry includes inorganic nano pottery, aqueous functional binding agent and water.
In a preferred embodiment of the invention, in terms of mass fraction, described mixed slurry includes 10～50% inorganic receive
Rice pottery, 5～the water of aqueous functional binding agent, 40～80% of 30% and 1～the acrylate of 10%.Wherein, described mixing
Slurry preferably includes the inorganic nano pottery of 15～40%, and the kind of described inorganic nano pottery is as previously mentioned.The present invention is preferred
Using inorganic nano ceramics, its granularity can be 0.1～1 μm.
In embodiments of the present invention, described mixed slurry preferably includes the aqueous functional binding agent of 8%～25%, described water
The contents such as the kind of sexual function binding agent are as it was previously stated, use corresponding commercially available prod.Described mixed slurry preferably includes
50～the water (H of 80%2O), inorganic nano pottery and aqueous functional binding agent is made to be dispersed in solvent H2In O, to environment without dirt
Dye.Described mixed slurry preferably includes the acrylate of 3～8%, disperses and stablizes nano-ceramic particle, to nano-ceramic particle
Between and ceramic particle and barrier film between also play certain cementation.The embodiment of the present invention is by mixing above each material
Close, preferably with the linear velocity more than 20m/s, as 25m/s high speed dispersion is uniform, prepare mixed slurry.
The embodiment of the present invention is coated with at barrier film substrate surface and is covered with described mixed slurry, is then dried, and forms mixed material layer
I.e. mixed coating, obtains lithium ion battery separator.Wherein, described in be applied to technological means well known to those skilled in the art, can
Realizing in the way of by intaglio printing, the present invention is not particularly limited.Described being dried is preferably the mode toasted, baking temperature
Can be 60～90 DEG C.Gained barrier film finished product can be single or double coating, and the mixed coating thickness of every is preferably 1～5 μm.
Or, inorganic nano ceramic size and aqueous functional binding agent slurry are respectively coated with by other embodiments of the present invention
In barrier film substrate one or both sides, drying, obtain lithium ion battery separator.Wherein, described aqueous functional binding agent slurry bag
Include aqueous functional binding agent and water.
In a preferred embodiment of the invention, in terms of mass fraction, described inorganic nano ceramic size includes 10～50%
Inorganic nano pottery, 40～the water of 80% and 1～the acrylate of 10%.Described aqueous functional binding agent slurry include 10～
The water of aqueous functional binding agent, 60～80% of 30% and 1～the acrylate of 10%.The embodiment of the present invention will be by will be the most each
Material mixes respectively, preferably with the linear velocity more than 20m/s, as 25m/s high speed dispersion is uniform, prepares inorganic nano respectively
Ceramic size and aqueous functional binding agent slurry.It should be noted that the contents such as the kind of each material are as it was previously stated, at this no longer
Repeat one by one.
After obtaining inorganic nano ceramic size and aqueous functional binding agent slurry, the embodiment of the present invention can by both respectively
It is coated in the two sides of barrier film substrate, drying, forms inorganic nano ceramic layer and aqueous functional adhesive layer respectively, thus obtain
Lithium ion battery separator.The embodiment of the present invention can also be initially formed receive at one coating inorganic nano ceramics slurry of barrier film substrate
Rice ceramic coating, it is adhesive coated that ceramic coating surface forms function by coating aqueous functional binding agent slurry again, thus
To lithium ion battery separator.
Wherein, described in be applied to technological means well known to those skilled in the art, can be real by the way of intaglio printing
Existing, the present invention is not particularly limited.Described being dried is preferably the mode toasted, and baking temperature can be 60～90 DEG C.In the present invention
Some embodiments in, the thickness of nano ceramic coat can be 2～5 μm, and the adhesive coated thickness of function can be 0.5～2 μm.
The embodiment of the present invention will be dispersed in H2Aqueous functional binding agent in O mixes coating or difference with inorganic nano pottery
Coating, the aqueous coating of formation has substantial amounts of micro channel, also can be bonded together with barrier film by electrode simultaneously, not affect lithium
The passage of ionic conduction, barrier film serviceability is good, can be greatly improved the security performance of battery.Further, the present invention is also
Ageing process after hot pressing in cell manufacturing process or fluid injection be need not too much requirement and management and control, it is not necessary to worry electrolyte pair
Adhesive coated dissolving and plug-hole, the cycle performance of battery is more reliable and more stable, and security performance is more preferable.Additionally, due to solvent
It is H2O, also environmentally safe.
Embodiments provide a kind of polymer Li-ion battery, including electrode, electrolyte and barrier film, wherein, institute
Stating barrier film is lithium ion battery separator mentioned above.
The polymer Li-ion battery that the present invention provides uses lithium ion battery separator mentioned above, has more stable
Cycle performance of battery reliably, security performance is more preferable.
Wherein, the content of described lithium ion battery separator is not as it was previously stated, repeat them here.The present invention to described electrode and
Electrolyte is all not particularly limited, and electrode can use polymer Li-ion battery negative pole commonly used in the art, positive pole, electrolyte
It can be lithium-ion battery electrolytes commonly used in the art.In some embodiments of the invention, positive pole can be cobalt acid lithium；Negative pole
Can be graphite.
In a preferred embodiment of the invention, described negative material includes: graphite, SiOxAnd conductive agent.Wherein, described
SiOxContent can be 10wt%～50wt%；The content of described conductive agent can be 1wt%～5wt%.Concrete, described SiOx
Can be simple substance Si and SiO2Homodisperse three-dimensional netted composite；Described conductive agent is preferably carbon nano-fiber and/or carbon
Nanotube.Present invention preferably employs the pure Delanium of second particle mixed single crystal granule, mix 10～50%SiOx, add simultaneously
Add 1～the VGCF carbon nano-fiber conductive agent of 5%；Wherein SiOxFor simple substance Si and SiO2Homodisperse three-dimensional netted composite wood
Material.Present invention preferably employs above-mentioned negative material, can make the polymer Li-ion battery of preparation have higher energy density and
Long circulating performance.
It addition, in a preferred embodiment of the invention, lithium-ion battery electrolytes includes: solvent and additive；Described molten
Agent includes: propyl propionate；And any two or three in ethylene carbonate, diethyl carbonate and Allyl carbonate；Described
Additive includes: sulfuric acid vinyl ester, fluorinated ethylene carbonate, adiponitrile, ethylene glycol (double propionitrile) ether, 1,3-propyl sulfonic acid lactone
And fluorobenzene.
Wherein, described solvent preferably includes ethylene carbonate, diethyl carbonate, propyl propionate and Allyl carbonate.At this
Invent in some embodiments, be in terms of 100% by solvent, the volume content of described ethylene carbonate (EC) be 10%～
50%；The volume content of described diethyl carbonate (DEC) is 10%～50%；The volume content of described propyl propionate be 10%～
50%；The volume content of described Allyl carbonate is 10%～50%.It is further preferred that described solvent includes: ethylene carbonate
Ester 10%～30%；Diethyl carbonate 10%～30%；Propyl propionate 10%～30%；Allyl carbonate 10%～30%.
Described additive the most also includes: vinylene carbonate and/or succinonitrile.In some embodiments of the invention, institute
State additive to include: sulfuric acid vinyl ester (DTD), fluorinated ethylene carbonate (FEC), adiponitrile (ADN), ethylene glycol (double propionitrile)
Ether, 1,3-propyl sulfonic acid lactone, fluorobenzene, vinylene carbonate and succinonitrile.Concrete, with electrolyte total amount for 100%, described
Additive in terms of mass content, including:
It is further preferred that described additive includes:
In some currently preferred embodiments of the present invention, lithium-ion battery electrolytes includes:
In terms of solvent 100%, volume content is:
In terms of electrolyte total amount 100%, mass content is:
Embodiments provide the preparation method of a kind of polymer Li-ion battery, comprise the following steps:
Electrode and barrier film are wound successively and seal, injects electrolyte after baking, then carry out hot pressing, obtain polymer
Lithium ion battery；Described barrier film is lithium ion battery separator mentioned above.
The production technological process of the polymer Li-ion battery that Fig. 2 provides for some embodiments of the invention.The present invention is real
Execute example and can use aluminum plastic film stamp, by end face and side by electrode plates with coat the barrier film finished product obtained above and be wound
Edge sealing, baking, fluid injection, then carry out hot pressing, chemical conversion, through partial volume, packaging, obtain resultant battery.
Wherein, electrode plates is not particularly limited by the present invention, can use pole piece commonly used in the art.The present invention's
In some embodiments, positive pole can be cobalt acid lithium；Negative pole can be graphite.In a preferred embodiment of the invention, described negative material
Including: graphite, SiOxAnd conductive agent.Wherein, described SiOxContent can be 10wt%～50wt%；The content of described conductive agent
Can be 1wt%～5wt%.Concrete, described SiOxFor simple substance Si and SiO2Homodisperse three-dimensional netted composite；Described
Conductive agent is preferably carbon nano-fiber and/or CNT.The preferred above-mentioned negative material of the present invention, can make the polymer lithium of preparation
Ion battery has higher energy density and long circulating performance.
In the present invention, described barrier film is lithium ion battery separator mentioned above, and its content is as previously mentioned.Described volume
Around, seal the technological means that the operation such as edge sealing is well known to those skilled in the art, the present invention is not particularly limited.Described baking
Temperature is preferably 80～90 DEG C, and the time is preferably 20h.
After baking, the embodiment of the present invention injects electrolyte, then after heat pressing process, available polymer Li-ion electricity
Pond.
Wherein, the electrolyte injected is not particularly limited by the present invention, can use electrolyte commonly used in the art or electricity
Solve liquid.In some currently preferred embodiments of the present invention, the content of electrolyte is as it was previously stated, the energy of lithium ion battery can be improved
Density.
In the present invention, the temperature of described hot pressing is preferably 80～90 DEG C, more preferably 85 DEG C；The time of described hot pressing is excellent
Elect 1～2h as.The present invention, after specific heat pressing process, is conducive to producing between inside battery and barrier film the most viscous
Knot, electrode will not deform upon and interface will not produce space, does not affect the passage of lithium ion conduction, will not be in cyclic process
Analysis lithium phenomenon in local occurs, and battery pole group also will not deform upon in cyclic process and bigger swelling, be conducive to following
The stability in ring life-span.
Further, owing to inorganic nano ceramic material has good thermostability, the thermal contraction performance of barrier film of the present invention
Significantly improve, and combine aqueous functional adhesive layer, barrier film is bonded together well with electrode, in security testing process
Or battery be needled extruding distortion the abuse such as bending time, or long-term when using under high ambient temperatures, internal electrode with every
Dislocation short circuit is less likely to occur film, and barrier film is not easy to be pulled short circuit, even if short circuit occurred inside, the pyrocondensation area of barrier film is not allowed
Easily expanding, the security performance of battery can be greatly improved.
After hot pressing terminates, the embodiment of the present invention carries out being melted into according to the mode that this area is conventional, partial volume, packaging (PACK),
Obtain polymer Li-ion battery.The present invention carries out performance detection, detection method and condition to resulting polymers lithium ion battery
According to standard GB/T 31241-2014 " portable type electronic product lithium ion battery and set of cells safety requirements ".Result table
Bright, the cycle performance of the polymer Li-ion battery that the present invention prepares is more reliable and more stable, and security performance is more preferable.
In order to be further appreciated by the application, the lithium ion battery separator that the application provided below in conjunction with embodiment, its system
Preparation Method and application are specifically described.
In following example, involved barrier film substrate is PE, and thickness is 7 μm (purchased from SK company of Korea S, PE 7 μm)；Receive
The granularity of rice ceramics is 0.7 μm, and acrylate is purchased from ZEON company of Japan, and model is BM-900B.
Embodiment 1
In terms of mass fraction, the aluminium oxide nano ceramics by 10%, the aqueous functional binding agent AFL (Japan of 30%
ZEON company, model is BM-2509), the acrylate of 1% and the water mixing of 59%, the linear velocity high speed dispersion with 25m/s is equal
Even, obtain mixed slurry；
Described mixed slurry is coated in barrier film substrate one side by gravure printing technique, under conditions of temperature is 90 DEG C
Baking, obtains lithium ion battery separator, and the thickness of its coating is 3 μm.
Described coating is scanned electronic microscope photos (SEM), and its electron scanning micrograph is as it is shown on figure 3, Fig. 3 is real
Execute the SEM photograph of the membrane surface coating that example 1 provides.
Embodiment 2
In terms of mass fraction, the hydroxide nanoparticle ceramics by 50%, PMMA (Chengdu Yin Dile company, the model of 5%
For LA133), the acrylate of 10% and the water mixing of 35%, uniform with the linear velocity high speed dispersion of 25m/s, obtain mixing slurry
Material；
Described mixed slurry is coated in barrier film substrate two sides by gravure printing technique, under conditions of temperature is 60 DEG C
Baking, obtains lithium ion battery separator, and the thickness of its coating is 3 μm.
Described coating is scanned electronic microscope photos (SEM), and as shown in Figure 4, Fig. 4 is real to its electron scanning micrograph
Execute the SEM photograph of the membrane surface coating that example 2 provides.
Embodiment 3
In terms of mass fraction, the water mixing of aluminium oxide nano ceramics, the acrylate of 5% and 55% by 40%, with
The linear velocity high speed dispersion of 25m/s is uniform, obtains inorganic nano ceramic size；PVDF (Japan A Kema Arkema by 10%
Company, model is LBG), the acrylate of 10% and the water mixing of 80%, the linear velocity high speed dispersion with 25m/s is uniform, obtains
Aqueous functional binding agent slurry；
Described inorganic nano ceramic size and aqueous functional binding agent slurry are respectively coated on by gravure printing technique
Barrier film substrate two sides, toasts under conditions of temperature is 70 DEG C, obtains lithium ion battery separator, wherein, and nano ceramic coat
Thickness is 3 μm, and the adhesive coated thickness of function is 1 μm.
Two finishing coats are scanned respectively electronic microscope photos (SEM), its electron scanning micrograph such as Fig. 5 and Fig. 6 institute
Show, the SEM photograph of the membrane surface nano ceramic coat that Fig. 5 provides for embodiment 3, the membrane surface that Fig. 6 provides for embodiment 3
The SEM photograph of PVDF coating.
Embodiment 4
In terms of mass fraction, the water mixing of hydroxide nanoparticle ceramics, the acrylate of 8% and 62% by 30%,
Linear velocity high speed dispersion with 25m/s is uniform, obtains inorganic nano ceramic size；PVDF (Japan A Kema by 25%
Arkema company, model is LBG), the acrylate of 5% and the water mixing of 70%, the linear velocity high speed dispersion with 25m/s is equal
Even, obtain aqueous functional binding agent slurry；
Described inorganic nano ceramic size and aqueous functional binding agent slurry are respectively coated on by gravure printing technique
Barrier film substrate two sides, toasts under conditions of temperature is 80 DEG C, obtains lithium ion battery separator, wherein, and nano ceramic coat
Thickness is 3 μm, and the adhesive coated thickness of function is 1 μm.
Two finishing coats are scanned respectively electronic microscope photos (SEM), its electron scanning micrograph such as Fig. 7 and Fig. 8 institute
Show, the SEM photograph of the membrane surface nano ceramic coat that Fig. 7 provides for embodiment 4, the membrane surface that Fig. 8 provides for embodiment 4
The SEM photograph of PVDF coating.
Embodiment 5
In terms of mass fraction, the water mixing of aluminium oxide nano ceramics, the acrylate of 3% and 77% by 20%, with
The linear velocity high speed dispersion of 25m/s is uniform, obtains inorganic nano ceramic size；Aqueous functional binding agent AFL (Japan by 20%
ZEON company, model is BM-2509), the acrylate of 8% and the water mixing of 72%, the linear velocity high speed dispersion with 25m/s is equal
Even, obtain aqueous functional binding agent slurry；
Described inorganic nano ceramic size is coated in barrier film substrate one side by gravure printing technique, is 65 DEG C in temperature
Under conditions of toast, formed nano ceramic coat, then described aqueous functional binding agent slurry is coated with by gravure printing technique
Overlaying on described nano ceramic coat surface, obtain lithium ion battery separator, wherein, the thickness of nano ceramic coat is 3 μm, function
Adhesive coated thickness is 1 μm.
Being scanned electronic microscope photos (SEM) respectively to described function is adhesive coated, its electron scanning micrograph is such as
Shown in Fig. 9, the SEM photograph of the membrane surface function binding agent AFL coating that Fig. 9 provides for embodiment 5.
Embodiment 6
By electrode (positive pole cobalt acid lithium (Tianjin Ba Mo company HCV-15D), negative pole graphite (Jiangxi Zi Chen company G1)) and reality
Execute the prepared barrier film of example 1 to be wound, use aluminum plastic film stamp, by end face and side edge sealing, 85 DEG C of baking 20h, be then injected into
Electrolyte (company of Xin Zhou nation, LBC-3045M), then carry out hot pressing, chemical conversion, hot pressing temperature is 85 DEG C, hot pressing time is 1h, passes through
Partial volume, packaging, obtain polymer Li-ion battery.
Resulting polymers lithium ion battery is carried out performance detection, detection method and condition according to standard GB/T
31241-2014 " portable type electronic product lithium ion battery and set of cells safety requirements ", testing result sees table 1, and table 1 is
Embodiment 6 gained battery all-round property testing result.
Table 1 embodiment 6 gained battery all-round property testing result
With above-mentioned gained battery as experimental group, and setting matched group, barrier film barrier film substrate embodiment 1 prepared is replaced,
Obtain matched group battery.Experimental group and matched group battery roll core pole group cross section deformation situation before and after contrast circulation, comparing result is joined
See that Figure 10, Figure 10 are experimental group and matched group battery roll core pole group cross section deformation situation before and after embodiment 6 circulation.Permissible from Figure 10
Finding out, matched group deformation is serious, and experimental group is undeformed.
Embodiment 7
By electrode (positive pole cobalt acid lithium (Tianjin Ba Mo company HCV-15D), negative pole graphite (Jiangxi Zi Chen company G1)) and reality
Execute the prepared barrier film of example 2 to be wound, use aluminum plastic film stamp, by end face and side edge sealing, 85 DEG C of baking 20h, be then injected into
Electrolyte (company of Xin Zhou nation, LBC-3045M), then carry out hot pressing, chemical conversion, hot pressing temperature is 85 DEG C, hot pressing time is 1h, passes through
Partial volume, packaging, obtain polymer Li-ion battery.
Detection method as described above, carries out performance detection to resulting polymers lithium ion battery, and testing result is joined
Being shown in Table 2, table 2 is embodiment 7 gained battery performance testing result.
Table 2 embodiment 7 gained battery all-round property testing result
Comparative example 1
In terms of mass fraction, the water mixing of aluminium oxide nano ceramics, the acrylate of 5% and 65% by 30%, with
The linear velocity high speed dispersion of 25m/s is uniform, obtains inorganic nano ceramic size；
In terms of mass fraction, oiliness function binding agent by 3% (A Kema Arkema company of Japan, model is 2801),
The acetone mixing of 97%, the linear velocity high speed dispersion with 25m/s is uniform, obtains oiliness function binding agent slurry；
Described inorganic nano ceramic size is coated in barrier film substrate one side by gravure printing technique, is 90 DEG C in temperature
Under conditions of toast, form the nano ceramic coat that thickness is 3 μm；Again by dipping process, by above-mentioned oiliness function binding agent
Slurry is coated in nano ceramic coat surface, toasts, obtain lithium ion battery separator, its oiliness under conditions of temperature is 90 DEG C
The adhesive coated thickness of function is 2 μm.
By electrode (positive pole cobalt acid lithium (Tianjin Ba Mo company HCV-15D), negative pole graphite (Jiangxi Zi Chen company G1)) and system
The barrier film obtained is wound, and uses aluminum plastic film stamp, by end face and side edge sealing, 85 DEG C of baking 20h, is then injected into electrolyte
(company of Xin Zhou nation, LBC-3045M), then carry out hot pressing, chemical conversion, hot pressing temperature is 85 DEG C, hot pressing time is 1h, through partial volume,
Packaging, obtains polymer Li-ion battery.
Embodiment 8
By embodiment 6 experimental group gained battery, embodiment 6 matched group gained battery and comparative example 1 gained battery Progressive symmetric erythrokeratodermia
Can contrast, according to standard GB/T 31241-2014, " portable type electronic product lithium ion battery and set of cells are wanted safely in test
Ask ", test condition is 25 DEG C of 0.7C/0.5C circulations.It is embodiment 6 experimental group, matched group gained electricity that result sees Figure 11, Figure 11
Pond and the performance comparison result of comparative example 1 gained battery.
In Fig. 1, curve 1 is the capacity that embodiment 6 experimental group uses aqueous/nano ceramics+function binding agent diaphragm cell
Keeping curve, curve 2 is that comparative example 1 uses the capacity of oiliness/nano ceramics+function binding agent diaphragm cell to keep curve, bent
The capacity of the diaphragm cell that line 3 could be used without coating for matched group keeps curve.Fig. 1 middle and lower part, multiple Grey Points are matched group
Could be used without the thickness change numerical value of the diaphragm cell of coating, multiple black points are that comparative example 1 uses oiliness/nano ceramics
The thickness change numerical value of+function binding agent diaphragm cell, multiple black use aqueous/nano ceramics+merit for experimental group a little louder
The thickness change numerical value of energy binding agent diaphragm cell.
It can be seen from figure 11 that embodiment 6 experimental group capability retention after circulating 500 times is far longer than 80%, and electricity
Pond thickness change is less than 10%, is superior to the performance of comparative example 1 gained battery, and capacity when matched group circulates in the 300th time
Conservation rate is less than 80%, and thickness change is much larger than 10%.
As seen from the above embodiment, the embodiment of the present invention by arranging inorganic nano ceramic layer at barrier film substrate surface, with
And aqueous functional adhesive layer, this two-layer can be separately positioned on barrier film substrate two sides or one side, it is also possible to is made pottery by inorganic nano
The materials such as porcelain and aqueous functional binding agent mix, and form mixed material layer at barrier film substrate one or both sides, prepare lithium from
Sub-battery diaphragm.The lithium ion battery separator that the embodiment of the present invention prepares, for polymer Li-ion battery, can make electricity
Producing bonds well between pond internal electrode and barrier film, electrode will not deform upon and interface will not produce space, does not affect lithium
The passage of ionic conduction, will not occur analysis lithium phenomenon in local in cyclic process, and battery pole group also will not be sent out in cyclic process
Raw deformation and the stability of bigger swelling, beneficially cycle life.Further, have due to inorganic nano ceramic material
Having good thermostability, the thermal contraction performance of barrier film significantly improves, and combines aqueous functional adhesive layer, by barrier film with electrode very
Be bonded together well, in security testing process or battery be needled extruding distortion the abuse such as bending time, or long-term at height
When using under temperature ambient temperature, dislocation short circuit is less likely to occur for internal electrode and barrier film, and barrier film is not easy to be pulled short circuit, even if
Short circuit occurred inside, the pyrocondensation area of barrier film is not easy to expand, and the security performance of battery can be greatly improved.
It addition, the aqueous coating formed on embodiment of the present invention barrier film has substantial amounts of micro channel, simultaneously to battery system
After hot pressing during Bei or fluid injection, ageing process need not too much requirement and management and control, it is not necessary to worries that electrolyte is to adhesive layer
Dissolving and plug-hole, the cycle performance of battery is more reliable and more stable, and security performance is more preferable, also environmentally safe, is beneficial to application.
The above is only the preferred embodiment of the present invention, it is noted that for making the professional technique of the art
Personnel, on the premise of without departing from the technology of the present invention principle, are that by the multiple amendment to these embodiments, and these
Amendment also should be regarded as the scope that the present invention should protect.
Claims (13)
1. a lithium ion battery separator, it is characterised in that including:
Barrier film substrate；
Being compounded in the aqueous functional layer of described barrier film substrate surface, described aqueous functional layer has multiple micropore, described aqueous merit
Ergosphere has viscosity.
Lithium ion battery separator the most according to claim 1, it is characterised in that the plurality of micropore is uniformly distributed.
Lithium ion battery separator the most according to claim 1, it is characterised in that described aqueous functional layer has thermostability.
4. according to the lithium ion battery separator according to any one of claims 1 to 3, it is characterised in that described barrier film substrate has
There are first surface and the second surface opposing with described first surface；
Described aqueous functional layer includes inorganic nano ceramic layer and aqueous functional adhesive layer；
Described barrier film substrate first surface is compounded with described inorganic nano ceramic layer；
Described barrier film substrate second surface is compounded with described aqueous functional adhesive layer；Or；
Described inorganic nano ceramic layer and aqueous functional adhesive layer are all compounded in described at least one surface of barrier film substrate；
Or；
Described aqueous functional layer is the mixing material being made up of the mixed material including inorganic nano pottery and aqueous functional binding agent
The bed of material；Described at least one surface recombination of barrier film substrate has mixed material layer.
Lithium ion battery separator the most according to claim 4, it is characterised in that described inorganic nano ceramic layer and aqueous merit
Adhesive layer stacking can be compounded in described at least one surface of barrier film substrate.
Lithium ion battery separator the most according to claim 4, it is characterised in that described inorganic nano pottery is selected from Al2O3Receive
Rice pottery and Mg (OH)2One or more in nano ceramics.
Lithium ion battery separator the most according to claim 4, it is characterised in that described aqueous functional binding agent is selected from aqueous
One or more in function binding agent AFL, PVDF and PMMA.
Lithium ion battery separator the most according to claim 4, it is characterised in that the thickness of described inorganic nano ceramic layer is
2～5 μm, the thickness of described aqueous functional adhesive layer is 0.5～2 μm.
Lithium ion battery separator the most according to claim 4, it is characterised in that the thickness of described mixed material layer is 1～5
μm。
10. a preparation method for lithium ion battery separator, comprises the following steps:
Inorganic nano ceramic size and aqueous functional binding agent slurry are respectively coated on barrier film substrate one or both sides, through dry
Dry, form inorganic nano ceramic layer and aqueous functional adhesive layer respectively, obtain lithium ion battery separator；Described aqueous functional glues
Knot agent slurry includes aqueous functional binding agent and water；
Or, mixed slurry is coated in barrier film substrate one or both sides, drying, forms mixed material layer, obtain lithium ion
Battery diaphragm；Described mixed slurry includes inorganic nano pottery, aqueous functional binding agent and water.
11. 1 kinds of polymer Li-ion batteries, including electrode, electrolyte and barrier film, it is characterised in that described barrier film is that right is wanted
Seek the lithium ion battery separator according to any one of 1～9.
The preparation method of 12. 1 kinds of polymer Li-ion batteries, comprises the following steps:
Electrode and barrier film are wound successively and seal, injects electrolyte after baking, then carry out hot pressing, obtain polymer lithium from
Sub-battery；Described barrier film is the lithium ion battery separator according to any one of claim 1～9.
13. preparation methoies according to claim 12, it is characterised in that the temperature of described hot pressing is 80～90 DEG C, described
The time of hot pressing is 1～2h.
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| CN112909429A (en) * | 2019-11-15 | 2021-06-04 | 珠海恩捷新材料科技有限公司 | Power battery diaphragm and lithium battery thereof |
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